Hello Guys,
I have a confluence macro that is working fine in Confluence version 7.x
Now I am going to upgrade my macro to support confluence 8.x (8.5.0), I am facing a few issues while upgrading it.
I couldn't access the preview page before publishing on Confluence when I clicked the preview button. I was facing this error.

I'm not sure what I'm missing, so if anyone can help, that would be great.
Please let me know if you require any additional details from my end.
Any support you can give would be greatly appreciated.